I was able to install this plugin in Sublime Text 3 using the following commands:
cd ~/Library/Application\ Support/Sublime\ Text\ 3/Packages/
git clone https://github.com/thie1210/hyperion.git "Hyperion for gettext"
It appears to work fine in ST3. However, it is not part of Package Control's list. It should be. This pull request sublimehq/package_control_channel#2716 should accomplish that.